repurify

例句：

1. 1. The water was so polluted that it needed to be repurified before being used again.
   水被污染到了极点，需要再次净化后才能使用。
2. 2. The company decided to repurify its wastewater system to improve efficiency.
   公司决定重新净化其废水系统以提高效率。
3. 3. The scientists are working on a new method to repurify the contaminated water.
   科学家们正在研究一种新的方法来净化受污染的水。